<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="http://g.tbcdn.cn/mtb/lib-flexible/{{0.3.2}}/makegrid.js"></script>
    <style>
        #app{
            width: 10rem;
            height: 100px;
            background-color: red;
            margin-left: auto;
            margin-right: auto;
        }
    </style>

</head>
<body>
    <div id="app"></div>
</body>
</html>